viruses Microbiology 15 metabolism 8 fungi 5 Molecular genetics 4 Human pathogens Archcebacteria 3 Microbial metabolism 3 Plant pathology 3 bacteria 3 cell division 3 ecology 3 microbial genetics 3 morphology 3 Bioreactors 2 DNA-agar 2 Microbial genetics 2 Ultramicrobes 2 bubble 2 cells 2 diseases - parasitic, non - parasitic 2 dna-agar 2 microbial growth 2 plant pathology 2 Archebacteria 1 Bacterial staining 1 Biochemistry 1 Biology 1 Cell division 1 Food microbiology 1 Genetics 1